Rubber type.



' PATENTED AUG. 30, 1904.

J. S. DUNCAN.

. RUBBER TYPE.

APPLICATION FILED APR. 27, 1903. no MODEL. I

"* IIEEEEIEEEIEi UNITED STATES Patented August 30, 1904.

PATENT, Oriucn.

JOSEPH S. DUNCAN, OF CHICAGO, ILLINOIS, ASSIGNOR TO ADDRESSO- I GRAPHCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

RUBBER TYPE.

SPECIFICATION forming part of Letters Patent No. 768,981, dated August30, 1904. Application filed April 27, 1903. Serial No. 154,520. (Nomodel.)

To all whom it may concern.-

vide a type which can be easily moved to its proper position in a holderand which will engage the holder with sufiicient friction to preventaccidental displacement after being properly set.

My present invention can be embodied with the style of type covered byLetters Patent No. 656, 1&2, dated August 21, 1900, or with any otherstyle of rubber type adapted to be arranged in a holder; but I havechosen to illustrate the invention in connection with the patented typeaforesaid and the type-holder (iovered by Patent No. 656,443 of the samec ate.

Referring to the drawings, Figure 1 illustratesa form made of saidpatented type not embodying this invention and set up in said patentedholder in the manner heretofore practiced. Fig. 2 is a perspective viewof a single type embodying my invention. Fig. 3 shows a logotypeembodying the invention. Fig. 4 is a transverse sectional view through aholder containing a form made with my improved type. Fig. 5 shows astraight-sided type embodying the invention. r

The type-holders 12 have been made of shee metal cut and stamped intoproper form with one or more type-grooves 11. The type have been made ofabout the same width as the groove, so that they can be easily set up inthe groove. To secure the type properly in place in the holder, slugs orblank-faced type 9 have been set in the groove at each end of the line,as shown in Fig. 1. These slugs are made wider than the type, so thatthey will become firmly wedged in the groove and hold the type in place,and for this reason more care and labor is required to set them upproperly.

To avoid the necessity for the employment of slugs or separate means forsecuring the type in the grooves and to cause type to fit snugly andsufficiently tight in the holder, while at the same time permitting themto be set up and adjusted freely, I provide a protuberance 13 on thefront or back of the type with a frictional engaging face ofless Widththan the front or back to engage the holder with suificient friction tohold the type against accidental movement after it has been set inposition. This protuberance may be of any suitable form and preferablyextends lengthwise in the direction of the height of the type and withinthe edges of the front or back on which it is located and varies inheight between its ends. When the invention is embodied in my patentedtype aforesaid, I prefer to locate the protuberance above the ofliset 14to engage the inwardly-project'- ing side 15 of the holder. Theseprotuberances do not retard the setting-up operation, but are ofsu'flicient size to make proper frictional contact with the holder toprevent accidental lateral movement of the type in the groove during theprinting operation.

In practice it has been found that rubber type will shrink more or lessafter they have been made awhile and that the type-grooves vary in widthmore or less owing to the dies wearing, to the action of thestamping-machine, and to the resiliency of the sheet metal. For thesereasons the type sometimes fit loosely in the holder and alineimperfectly; but when they are provided with protuber- 'ances, asdescribed, the ordinary variations inthe width of the type and in thewidth of the grooves become immaterial, as the protuberances will alwayspresent sufficent frictional engaging surface with the holder to securethe type in place.

I desire to have it understood that in the consideration of myinvention, and especially in the claims, I use the word type to includeall forms and sizes of types and logotypes.

Without limiting myself to the exact construction and arrangement ofparts herein Eli shown and described, What I claim, and desire to secureby Letters Patent, is

1. A rubber type provided on its front or back with a protuberance tofrictionally engage a type-holder, said frictional engagement notretarding the setting-up operation but being sufiicient to preventaccidental lateral movement of the type after it has been properly setin the holder.

2. A rubber type provided on its front or back with a protuberancehaving a frictional engaging face of less width than the front or backto engage a type-holder with suflicient friction to prevent accidentallateral movement of the type after it has been properly set in theholder.

3. A rubber type provided on its front or back and located Within theedges thereof With a protuberance to engage a type-holder withsufficient friction to prevent accidental lateral movement of the typeafter being set up in the holder.

4%. A rubber type provided on its front or back With a protuberancevarying in height between its ends.

5. A rubber type provided on its front or back With a protuberanceextending length- Wise in the direction of the height of the type andWithin its side edges.

6. The combination of a type-holder having an inwardly-projectingsideWall, of a rubber type provided With a protuberance to engage said sideWall With sufficient friction to prevent accidental lateral movement ofthe type after it has been properly set in the holder.

JOSEPH S. DUNCAN.

Witnesses:

WM. O. BELT, HELEN L. PECK.

